Hello, I bought a 2020 grom, it has been modified about as much as you can. Thing is it has a low mount muffler made by Zoom....and its so damn loud !! I've been looking on line for something else, but its to hsrd to tell by looks what a muffler sounds like. So is anybody using an aftermarket muffler that has a nice tone, without scarring little kids, and making the neighbors hate you ? I prefer a nice low tone without all the crackling and backfiring and just over all crap sound. I'm not trying to blow $500 either, just need the muffler it has a nice header already. Thanks for your advice.